Thread-cutting mechanism for looms



Sept.- 27, 1927. 1,643,422

E. H. RYON THREAD CUTTING MECHANISM FOR LOOMS O g Filed Aug. '29, 1921 y rwmbw I W W Wu)! minmuy Patented Sept. 27, 1927.

outrun stares ear EPPA H. RYON, on :PAsAnnNA, oALIronnIA. .assrsnon 'ro OROMPTON 85 names LOOM WORKS, OF WORCEgTER, MASSACHUSETTS. A CGRPUTRATION OF MfiS SACHU-q SETTS.

THREAD-CUTTING JVIECTIAI TESM FQR LOOMEi.

Original application filed August 29,

This application is a division of Serial No. 196,351, filed by me August 29, 1921, and relates particularly to the thread cutting mechanism shown but not claimed in said prior application.

1 It is one important object of my invention to provide a thread cutter and actuating connections therefor so constructed that the cutterj may be removed from Operative position and returned thereto without disengagement of the actuating connections, while at the same time the cutter is rendered inoperative so long as it is out of cutting position.

Further features of my invention relate to the provision of an improved ratchet device for actuating certain moving parts of the mechanism to an improved thread cutter, and to other arrangements and combinations of parts which will be hereinafter described and more specifically pointed out in the appended claims;

A preferred form of the invention is shown in the drawings in which Fig. 1 is a plan view of a thread cutter embodying my invention; and

Fig. 2 is a side elevation thereof.

Referring to the drawings, I have shown portions of a loom frame 10, a lay 11, a rear shuttle box plate 12, and a weft carrier transferrer 14, mounted upon a fixed pivot 15. A stand 20 is secured to the loom frame 10 and is provided with guides 2122 for a slide 23, which is yieldingly held in rearward position by a spring 24 mounted within the slide. 7

One end of the spring 24 engages a shoulder at the rear of the slide 23 and the other end engages a projection 26 on the stand 20*. This projection 26 acts as a stop to limit rearward movement of the slide and also provides a bearing for a sliding rod 25,

fixed in the slide 23 and acting to center the spring 2 1.

The front end of the slide 23 or of the rod. 25 engages suitable connections (not shown) through which the loom will be 1921, Serial no. 498.1251. Divided .24, 1925. Serial No. 4,548.

the shuttle is too widelymisplacedithe shut tle directly engages the roll 28 and moves'theslide 23 forwardagainst the pressure of the spring 2 1, thus stopping the loom.

A friction belt 31 is supported bya 32 ad ustably secured to the rear end of theslide 23 by a stud 33. A belt 31 also passes around a feed roll 34 mounted on the stud guide o 36 is mounted ona stud 37,"vertensionthe same.

and application filed January ant emce v 66 35 at the front of the slide 23.. An idle or pending projection of the slide 23 and'is yieldingly pressed against the underside 'of the belt 31 by alight coil spring 42. A The feed roll 34: has internal ratchet teeth 43 engaged by a feed pawl 44 mounted on a:

bell crank 4-5 also pivoted on thestud 35. 'A 2 spring 46 is connected to one end-0f the feed pawl. 44 and to a lug or projection on the bell crank and holds the pawl in engagement with the ratchet teeth. An arm 47 is secured to the bell crank 45. and is connected by a telescoping link 48 to an arm 49 depending I from the transferrer 14. Each downward movement of the transferrer thus provides an operating or feed stroke of the-pawl 44;.

A thread cutter is mounted on the slide 23 and is positioned between thev shuttle The cutter placer. and the friction belt. comprises a jaw 50 secured to the slide 23 by screws 51 and a movable jaw 52 pivoted to theslide at 53. and having a depending arm 54 connected by a link 55 to one arm of the bell crank 45. .Downward .movement of the transferrer thus also operates through the link 55 to close the thread cutting jaws 50 and 52 and sever the thread at'the time of transfer.

Reference to Fig. 2 will show, however, 95

that the closing of the cutting jaws is delayed until the pivotal connectionof the link 55and bell crank-4L5 hasmoved downward to and past the deadcenter. The operation of the transferrer being substan tially at front center for the lay, the action of the thread cutter is substantially later than the effective operation of the shuttle placer. This allows the friction belt to secure a firm hold on the thread before the 60 holding means includinga continuous fric- -ing mechanism therefor scoping link 4.8 are partially separated so' that downward movement of the transferrer will notcause any corresponding operation of the bell crank l5 and of the parts associated therewith. Upon the return of the slide 23 to rearward position, the telescoping parts of the link 48 immediately erative relation,

My improved thread cutter and the act-na are peculiar'ly adapted for use in a loom in which a fresh resume opweft carrier is transferred on the same beat 5 i center.

of'the lay on which weft exhaustion is indicated, as the cutter operates after front The friction belt 31 co-operating with the friction plate provides a reliable and effective device for grasping the weft. during the operation of the thread cutter and for thereafter holding the severed weft end wwhich projects from the selvage until the regular temple cutter operates to sever the weft close to the edge of'the cloth.

Particular attention is called to the fact that the ratchet mechanism by which the belt 31 is advanced intermittently is positioned within the ratchetwheel or pulley do, so that it is protected from injury so that the pawl 44 is always in position to engage the ratchet teeth 43. All parts which tsupport the belt 31 are mounted on and movable with the slide 23, a marked impr'ovement over the construction shown in my prior Patent No. 1,009,997, issued Novem ber 28, 1911. a p

Having thus described my invention and the advantages thereof it will be seen that I have provided a very simple and eflicient which is; not liable to displacement or failure thread cutting mechanism which is well adapted for the purposes indicatech and when in use. 1 I

In consequence, I do not wish to be limited to the'de-tails herein disclosed otherwise than as set forth in the claims, but what I claim 1'. In a loom having Weft replenishing mechanism, a slide mounted for movement relative .to the replenishing mechanism, a threadcutter mounted on said slide, thread tion surface mounted entirely on said slide to belt carried entire'lyon and movable with said support to present the weft thread to the cutter, said belt being under continuous unifornrtension in every position of said slide, and a separable connection between the replenishing mechanism and said cutter and weft-presenting means, said connection operating said cutter and said presenting means at transfer but permitting said cutter and said, presenting means to remain inoperative when the support is moved forward from normal positionby a widely misplaced shuttle. j

3, In a loom having a lay and weftreplenishing mechanism, in combination, a thread cutter, means to present a weft thread to said cutter, operating mechanism for said presenting means and cutter, a support in which said parts including said operating mechanism are mounted for movement as a unit toward and from the la-y in continuous operative relation, and a connection between the replenishing mechanism and said operat-- ing mechanism effective to give the latter operative movements when the replenishing mechanism operates, but permitting said outter, said presenting mechanism and said operating mechanism to move bodily and as a unit with the lay to an abnormal forward position independently of the weft replenishing mechanism and thereby disabling the operating connection and preventing thread cutting action.

1. In a Tloom having weft replenishing mechanism, a thread cutter, mounted support forsaid cutter, means carried entirely on and movable with said support to present the weft thread to the cutter, and a link between said replenishing mechanism and said cutter, said link having telescoping and freely separable members.

5. In a loom, in combination, a slide, a

vthread cutter thereon, a feed pulley and a guide pulley on said slide, a friction belt on said pulleys, said feed pulley having internal ratchet teeth, a feed pawl mounted within-said feed pulley and engaging said a slidably teeth, and actuating means for said pawl.

In testimony whereof I have hereunto affixed my signature;

EPPA H. RYoN. 

